package com.adou.d9.api;

public class Test {
    public static void main(String[] args) {
        StringBuilder sb = new StringBuilder();
        sb.append("java");
        sb.append("c#");
        System.out.println(sb);//拼接javac#

        sb.reverse();
        System.out.println(sb);

        System.out.println(sb.length());


        String s = sb.toString();
        System.out.println(s);
    }

}
